Battery polarity insensitive integrated circuit amplifier
US6462929B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 29, 2000 |
| Grant date | Oct 8, 2002 |
| Priority date | — |
| Expiry date | Nov 29, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2225/33
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A compact polarity-insensitive integrated circuit amplifier is described designed to be powered by a miniature low voltage battery of variable polarity. Low current, polarity corrected voltage sources are integrated into functional blocks to supply low current non-bidirectional elements and to provide a constant polarity bias to a substrate of CMOS circuits. Polarity corrected voltage sources are used to provide a polarity sensing function. The invention is embodied in a Class D amplifier which may comprise four n-channel MOSFET transistors arranged in an H-bridge configuration. Additional driver circuitry is described which increases the voltage of the pulse-width modulated input signal to the MOSFET transistors and also performs a pulse trimming function, which reduces parasitic crowbar currents in the amplifier output stage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.